Carburetor



Sept. 25, 1951 E E HANS y2,569,377 CARBURETOR Filed Dec. 6, 1948 2 Sheets-Sheetl l IN V EN i012. 'mzln Hana*- v BY,

E. E. HAN-s 2,569,377

CARBURETOR g Sheets-Sheet 2 Sept. 25, 1951 Filed Dec. e, 1948 Patented sept. 2'5, 1951 UNITED STA-TES.

CARBURETOR Edmund E. Hans, Detroit, Mich.

Application December 6, 1948; SeriaLNo. 63,1155;- In Canada January 28,1948

3 Claims. (Cl. .261-18) IThis application isv acontinuation in part of my pending. applicatipn Serial No. 602,218, now PatentNo. 2,480,853. j

The. invention relates to` improvements in carburetors and refers to carburetors wherein means are provided for automatically adding an antiknockliquid, suchas alcohol, to the gasoline when the: suction exerted by the. intake manifold drops below a predetermined minimum, say 6 to 8 inches off vacuum dependingv upon the quality of the gasoline being used", in order to prevent knock and increase the eiciency of the engine. When anengine isidling the suction exerted may be 27 inches. of. vacuumbut as the load increases the suction drops until when operating at or about full capacity, if gasoline alone is used, there is a grave danger that such a knock will developv that the. engine will. be severely damaged.

It is, therefore, an object of the invention to provide acarburetor with means for preventing the air intake valve from` opening fully if the antiknock liquidis. exhausted, thereby cutting down the amount. of gasoline drawn into the carburetor and the amount of combustible mixture reaching the engine. In this manner the power output of the engine is reduced to a point where knock is eliminated. V

Another object of the invention is to p-rovide a carburetor with means for automatically movingv the air intake valve from fully open to partly open position when the supply of anti-knock liquid runs out, if that occurs when the liquid is being added to the fuel.

Having thus briefly stated some of the objects and advantages of the invention. I will now describe it with the aid of the accompanying drawings, in which: n

Figure 1 is a side elevation of the invention, and

Figure 2 is a plan view thereof.

Figure 3 is a section on the line 3--3 of Figure 1.

Figure 4 is a diagrammatic view showing the plunger at a different position in the cylinder.

Figure 5 is a section on the line 5--5 of Figure 1.

vFigure 6 is a section on the line 6-6 of Figure 2.

Figure 7 shows a slight modication, and

Figure 3 shows the air intake valve held' in partly open position.

Referring to the drawings, l designates the body of a carburetor having float chambers 2 and 3 therein which are provided with inlet passages 4 and 5 and have oats ii and 'I respectively therein. The now through each inlet passage 4 and 5 into its chamber 2 and 3 respectively is controlled as shown in Figure 6 in connection with 2. the chamber 2 by a valve B operated upon movement of the iioatito open or c l'ose a port. Qi in the. passage 4. Formed also in the. body I is a mixing chamber I9 to which the chambers 2' and 3' are connected through passages LI and Ila and I2 and. 12a respectively formed' through the said' body; the passages, I'lj and I2. are upwardly in-f clined from the chambers and the passages IIa, and'lZa are above the normal liquid level in the chambers. In the passages II'a and Ig2a valve; seats I3 and, [4j are provided which are adaptedl to be closed. b y needle valves I5 and I6 are mounted in alignmentand extend through opposite sides of the body I. I'I and I8 denote springs each secured at one extremity to the body to urge the valves I5,` and I6 respectively toward their closed positions. y

Integral with the body I is a bracket I9' through which a pin 2.0 extends, andV mounted for sliding movement upon the latter is a member 2I having a lug 22 projecting laterally tllerefrom.v A, helical spring. 23. isV mounted' aroundthe pin 2li between the bracket. I9. and/the member 2l,` and formed upon the outer sideof. the. latter. is a. bearing face 24 against which a.v cammina element 2.5; pivoted atl 20a on the pin 26 is adapted. to b e. turned so that-by adiustmentof theY said element the spacing between the. bracket ISI-.and themember 2I is varied. 4Formed integral with and projecting fromv one. side the bracket I3V is a lug 26. f y

Pivoted on opposite sides ofl the bOdY. l are. bellcranksl 21 and 28. Connected at. its. extremities to one arm 21a..v andr 28a, of each of the belle cranks is a helicalspring 2-9- whichv tends to draw the outer extremities of these arms towardv one another, and threaded tlfiroughv these. arms are screws 30 and 3| the endsl of; which bearv against the lugs 22 and 26v respectively.. Pivoted on, the

L other arms 2lb and 2811 of the bellcr-anks are dogs 32 and 33 respectivelywhich are bent inter-v V-Inediately of their length.- Mounted for rotation on the bellcrank arms 21a and 2.81.1. are cams 34 and 35 respectively having substantially semicircular contacty faces 34a and 35a against which one extremity of thev dogs 32 and 33 respectively bear. The opposite ends of thesel dogs are seated in recesses 3B and 31 formed in the'stems of the valves l5 and I6 respectively. The cams 34' and 35 are connected by a link 38 so that when the cam 35 is turned in a manner hereinafter de. scribed the cam 34 is also rotated a similar angular distance so that movement is imparted to both the valves I5 and I6.

The purpose of the camming element 25 is to adjust the opening of the valve I relative to that of the valve I6. For as the element is turned the member 2I is moved toward or from the bracket I9 thereby causing the bellcrank 21 to turn about its axis and impart movement to the dog 32. Thus this adjustment occurs Without imparting an appreciable rotary movement to either of the cams 34 and 35.

Formed integral with the body I is a cylinder 4U having a piston 4I therein from which a rod 42 projects. The outer end of this rod is connected by a connecting link 42a to the cam 35. Y

Mounted for axial movement on a sleeve 40a integral with the cylinder 40 and through which the rod 42 extends is an annularly grooved flange 44; and secured on the rod 42 adjacent its outer extremity is a nange 45. Extending between the anges 44 and 45 around the rod 42 is a coil spring 46 which tends to retain the rod at its maximum outwardly projecting position. Mounted in the opposite end of the cylinder 4I) is a tubular connection 41 which is also connected to the intake manifold (not shown) so that as suction in the latter increases the piston 4I is moved to the left-Figures 3 and Ll--thereby turning the cams 34 and 35 in a clockwise direction and reducing the opening of the valves I5 and I6, or completely closing the former. Similarly as the Suction of the intake manifold decreases the piston 4I is moved back toward the right-Figures 3 and Ll--by the spring 46 and the cams are then rotated in the opposite direction to increase the opening of the said valves.

Integral with the cylinder 40 is a projection 64 on which a lever 65 is pivoted intermediately of its length. One extremity of this lever is bifurcated to engage opposite sides of the groove around the ange 44 and its opposite extremity has a control rod 66 pivotally attached thereto. By movement of the latter in the direction of the arrow A the closing of the valves I5 and I5 is retarded so that more alcohol is added to the mixture at any given amount o f suction exerted by the intake manifold. The rod 42 is threaded from its outer extremity for engagement with the flange 45 so that the spacing between the latter and the ange 44 may be adjusted to regulate the tension of the spring 46.

Provided in the body I above the mixing chamber I0, and in vertical alignment therewith is a conventional air inlet passage 50 having a rod 5I extending centrally across it and an ordinary butterfly valve 52 fixed on the said rod to control the ow of air through the passage. Fixed also on the rod 5I exteriorly of the passage 5U is anl arm 53 having an adjustable stop 53a projecting therefrom. 80 denotes a rod which terminates at one extremity in a tubular member 8l Formed in the latter intermediately of its length are opposed slots 82, and secured within the outer extremity of the tubular member is one extremity of a helical spring 83 the opposite end of which is secured to a pin 84. The latter passes through the opposed slots 82 and through one end of the arm 53 which projects into the member I through another slot 85 formed in the latter intermediately of its length. The spring 83 normally retains the pin 84 at the right hand end (Figure 1) of the slots 82 irrespective of the opening of the valve 52 which may be regulated by movement of the rod 80, however the arm 53 and the valve 52 may be turned about the pin 5I against the tension of the spring 83 so that the pin 84 travels to the opposite end of the slots 4 82, as shown in Figure 8, by means hereinafter described.

Mounted in the present instance on the air inlet passage 50 is a solenoid 54 having leads 55 and 5S connected thereto; the lead 55 is connected to a source of power (not shown) and the lead 56 to a terminal plate 51 mounted on and insulated from the body I. Also mounted on the latter is a terminal 58 having a resilient contact 55 projecting therefrom which tends to make a connection with the terminal plate 51, and extending from the terminal 58 is a lead 60 which is also connected to the source of power. Formed through the top of the chamber 2 is an aperture 2a through Which a pin 6I on the float 6 extends. This pin 5| is so arranged that as long as there is alcohol in the chamber to support the oat the pin 6I holds the resilient contact 59 in its raised position shown, but when the chamber 2 becomes empty and the float 5 drops to its position indicated at Sa the Contact 59 also drops and makes a connection as indicated at 59a with the terminal plate 51 whereupon the solenoid 54 is energized. If the Valve 52 is fully open when this occurs the plunger 62 in the solenoid 54 moves to its position 62a (Figure 8) thereby moving the stop 53a and turning the Valve 52 to its partly closed position 52a against the tension of the spring 83. Obviously as long as the alcohol supply is not replenished the plunger 62 remains in its position 62a so that it is impossible for the valve 52 to resume its fully open position. The purpose of this arrangement is to limit the maximum amount of air which may enter the passage 50 when the supply of alcohol is exhausted and only gasoline is being fed into the mixing chamber I0, for under such circumstances a full supply of air and a corresponding amount of gasoline might result in such a mixture that the motor would knock very badly, and might blow the head gasket or ruin the engine bearings.

Figure '7 shows a slight modication wherein a bellows 1Q is substituted for the cylinder 48. This bellows is mounted between two spaced, apertured flanges 1I and 12 formed integral with the body of the carburetor. Extending through the flange 1I and secured at one extremity to one side of the bellows into which it opens is a tubular connection 41awhich is also secured toV the said flange 1 I. The opposite end of this connection 51a is connected to an intake manifold (not shown). Mounted on and projecting from the opposite side of the bellows is a rod 42h which is axially movable through the flange 12 so that the length of the bellows is controlled and the rod 4212 is moved through the ilange 12 vby suction exerted by the manifold.

What I claim is:

1. A carburetor containing in combination, an air intake conduit having a valve therein to control air llow, two chambers one for fuel and one for anti-detonant liquid, each chamber being connected by passageways to the air intake conduit, a limit stop movable with the valve, a solenoid having a plunger therein adapted to travel to an extended position when the solenoid is energized to move the stop thereby partially closing the valve, and also adapted when extended to prevent full opening of the said Valve, an electric circuit comprising a switch to energize the solenoid, and means operable by the level of liquid in the anti-detonant chamber for operating the switch and solenoid.

2. A carburetor containing in combination, an air intake conduit having a valve therein to control air ovv in the conduit, two chambers one for fuel and one for anti-detonant liquid, each chamber being connected by passageways with the air intake conduit, an adjustable stop on the valve, a solenoid having a plunger movable therein adapted to be moved to an extended position to contact the stop when the solenoid is energized and partially close the valve if the latter is fully open, and adapted when it is in its extended position to prevent full opening of the said valve thereby limiting the maximum flow of air in the conduit, an electric circuit comprising a switch to energize the solenoid, a float resting on the liquid in the anti-detonant chamber, and means connected to the float and tothe switch for operating the latter at a given level of the liquid in the anti-detonant chamber.

3. A carburetor comprising in combination, an air intake conduit having a valve therein to control air ilow, a limit stop mounted on the valve for movement therewith, a chamber for anti-detonant liquid connected by passageways to the conduit, a solenoid having a, plunger therein adapted to be moved to extended position to contact the stop when the solenoid is enduit is reduced when the level of the anti-Y detonant in its chamber drops to a given level.

EDM'UND E. HANS.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED sTATEs PATENTS Number Name Date 1,338,104 Shurtleff Apr. 2'7, 1920 2,337,982' Ericson Dec. 28, 1943 2,377,607 Bodine June 5, 1945 2,392,565 Anderson et al. Jan. 8, 1946 2,462,796 Wheeler Feb. 22, 1949 

